Question

РЕшите побыстрее пж

Answer 1

$r = \frac{abc}{4s} \\ p = \frac{2 + 3 + 4}{2} = 4.5 \\ s = \sqrt{4.5(4.5 - 4)(4.5 - 3)(4.5 - 2)} = \sqrt{4.5 \times 0.5 \times 1.5 \times 2.5} = \frac{3 \sqrt{15} }{4} \\ r = \frac{2 \times 3 \times 4}{4 \times \frac{3 \sqrt{15} }{4} } = 8 \sqrt{15}$